Merit Abrasives 69957399720 Quick-change Disc 3 in 50 Grit

Product Description

The MERIT ABRASIVES 69957399720 is a coated quick-change abrasive disc designed for aggressive material removal on metal surfaces. It mounts via a Power-Lock Type R attaching system and is compatible with TR (Type III) quick-change tooling. The disc measures 3 inches in diameter and carries a 50-grit aluminum oxide abrasive bonded to a Y-weight 2-ply polyester and cloth backing. That rigid, heavy backing delivers a faster cut rate and extended disc life compared to lighter-weight alternatives. Rated to 20,000 RPM, this disc is built for production-pace work on handheld disc sanders used in fabrication, maintenance, and finishing trades.

This disc is suited for coarse-grade tasks including deburring, surface cleaning, and detailing on a range of metals. Rated material applications include 300 Series stainless steel, brass, bronze, hard carbon steels, soft carbon steels, and titanium. It is intended for use with handheld disc sanders equipped with TR or Type R quick-change arbors. The disc ships individually but carries a minimum order quantity of 50 units, making it appropriate for shop stocking or fleet-level consumable purchasing rather than single-unit jobsite use.

Key Features

• 50-grit coarse aluminum oxide abrasive for fast stock removal and deburring
• Y-weight 2-ply polyester and cloth backing for rigidity and extended service life
• Power-Lock Type R attaching system compatible with TR (Type III) quick-change tooling
• 20,000 RPM maximum speed rating for high-speed handheld disc sander use
• Rated for 300 Series stainless, brass, bronze, hard and soft carbon steels, and titanium
• Series R766 coated disc with brown disc color and black button

Compatibility

Designed for use with handheld disc sanders equipped with TR (Type III) or Type R quick-change arbor systems. Rated material applications include 300 Series stainless steel, brass, bronze, hard carbon steels, soft carbon steels, and titanium.

Installation Notes

Installation is performed by the operator or tool technician mounting the disc onto a compatible TR or Type R quick-change arbor. Confirm the tool spindle speed does not exceed the 20,000 RPM disc rating before operation. Inspect the disc for damage before each use and discard any disc showing cracks, tears, or delamination. Follow ANSI B7.1 and tool manufacturer guidelines for abrasive disc mounting and guard requirements.